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Physics 1 Problem Solutions 83

Physics 1 Problem Solutions 83 - Chapt 7 Kinetic Energy and...

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Chapt. 7 Kinetic Energy and Work 79 i) You exert 100 N of force in the direction of motion and push the block for 10 m. How much work have you done on the block? ii) Assuming you start the block from REST and no other forces do work, what is the final speed of the block? a) (i) 1000 J (ii) 4 m / s. b) (i) 10 J (ii) 5 m / s. c) (i) 10 J (ii) 10 m / s. d) (i) 1000 J (ii) 10 m / s. e) (i) 1000 J (ii) 6 . 3 m / s. Full-Answer Problems 007 qfull 00340 1 3 0 easy math: work and KE feat 1. You are pushing a 60 kg block across a frictionless surface—which is no mean feat in itself. a) You exert 100 N of force in the direction of motion and push the block for 30 m. How much work have you done on the block? Show how you got your answer. b) Assuming you start the block from REST and no other forces do work, what is the final kinetic energy and speed of the block? Show how you got your answer. 007 qfull 00350 1 3 0 easy math: work done on block on incline Extra keywords: (Ha-157:16e) 2. Power in physics is the rate per unit time of energy transferred or transformed. This is a general definition independent of the where the energy is coming from and where it is going too. If work
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